[llvm] 9851edf - [ConstraintElim] Add ptr phi tests without inbounds.

[Florian Hahn via llvm-commits]

Author: Florian Hahn
Date: 2023-08-17T11:09:56+01:00
New Revision: 9851edfc6cca9193aeb36551563631dee51e98d2

URL: https://github.com/llvm/llvm-project/commit/9851edfc6cca9193aeb36551563631dee51e98d2
DIFF: https://github.com/llvm/llvm-project/commit/9851edfc6cca9193aeb36551563631dee51e98d2.diff

LOG: [ConstraintElim] Add ptr phi tests without inbounds.

Extra test coverage for D152730.

Added: 
    

Modified: 
    llvm/test/Transforms/ConstraintElimination/monotonic-pointer-phis.ll

Removed: 
    


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diff  --git a/llvm/test/Transforms/ConstraintElimination/monotonic-pointer-phis.ll b/llvm/test/Transforms/ConstraintElimination/monotonic-pointer-phis.ll
index e6603ec30946c7..1d13b553ebd66e 100644
--- a/llvm/test/Transforms/ConstraintElimination/monotonic-pointer-phis.ll
+++ b/llvm/test/Transforms/ConstraintElimination/monotonic-pointer-phis.ll
@@ -1048,3 +1048,56 @@ exit:
   call void @use.i1(i1 %and)
   ret void
 }
+
+define void @test_monotonic_ptr_iv_inc_1_eq_to_uge_no_inbounds(ptr %start, i16 %len) {
+; CHECK-LABEL: @test_monotonic_ptr_iv_inc_1_eq_to_uge_no_inbounds(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[UPPER:%.*]] = getelementptr i32, ptr [[START:%.*]], i16 [[LEN:%.*]]
+; CHECK-NEXT:    [[LEN_NEG:%.*]] = icmp slt i16 [[LEN]], 0
+; CHECK-NEXT:    br i1 [[LEN_NEG]], label [[EXIT:%.*]], label [[LOOP_PH:%.*]]
+; CHECK:       loop.ph:
+; CHECK-NEXT:    br label [[LOOP_HEADER:%.*]]
+; CHECK:       loop.header:
+; CHECK-NEXT:    [[PTR_IV:%.*]] = phi ptr [ [[START]], [[LOOP_PH]] ], [ [[PTR_IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ]
+; CHECK-NEXT:    [[C:%.*]] = icmp eq ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT:    br i1 [[C]], label [[EXIT]], label [[FOR_BODY:%.*]]
+; CHECK:       for.body:
+; CHECK-NEXT:    [[T_1:%.*]] = icmp uge ptr [[PTR_IV]], [[START]]
+; CHECK-NEXT:    [[T_2:%.*]] = icmp ult ptr [[PTR_IV]], [[UPPER]]
+; CHECK-NEXT:    [[AND:%.*]] = and i1 [[T_1]], [[T_2]]
+; CHECK-NEXT:    br i1 [[AND]], label [[LOOP_LATCH]], label [[EXIT]]
+; CHECK:       loop.latch:
+; CHECK-NEXT:    call void @use(ptr [[PTR_IV]])
+; CHECK-NEXT:    [[PTR_IV_NEXT]] = getelementptr i32, ptr [[PTR_IV]], i16 1
+; CHECK-NEXT:    br label [[LOOP_HEADER]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  %upper = getelementptr i32, ptr %start, i16 %len
+  %len.neg = icmp slt i16 %len, 0
+  br i1 %len.neg, label %exit, label %loop.ph
+
+loop.ph:
+  br label %loop.header
+
+loop.header:
+  %ptr.iv = phi ptr [ %start, %loop.ph ], [ %ptr.iv.next, %loop.latch ]
+  %c = icmp eq ptr %ptr.iv, %upper
+  br i1 %c, label %exit, label %for.body
+
+for.body:
+  %t.1 = icmp uge ptr %ptr.iv, %start
+  %t.2 = icmp ult ptr %ptr.iv, %upper
+  %and = and i1 %t.1, %t.2
+  br i1 %and, label %loop.latch, label %exit
+
+loop.latch:
+  call void @use(ptr %ptr.iv)
+  %ptr.iv.next = getelementptr i32, ptr %ptr.iv, i16 1
+  br label %loop.header
+
+exit:
+  ret void
+}
+